Include new hires in team meetings, where they can participate. It helps them to feel more a part of the whole, so long as everybody has a voice.

"Research shows that a key characteristic of high-performing teams is that each team member has an equal chance to participate rather than allowing one or two word-hogs to hijack the meeting," writes Savina Nawaz for the Harvard Business Review.

Start a Training Program

Don't dump a load of boring tasks on new associates. Give them something to look forward to -- like a partnership track.